package collection;

import java.sql.SQLOutput;
import java.util.ArrayList;
import java.util.List;

public class LestDemo1 {
    public static void main(String[] args) {
       List<String> list = new ArrayList<>();

       list.add("one");
       list.add("two");
       list.add("three");
       list.add("four");
       list.add("five");
        System.out.println("list"+list);

        //获取下标3的元素
        String e = list.get(3);
        System.out.println(e);//four
        for (int i=0;i<list.size();i++){
            System.out.println(list.get(i));
        }
        System.out.println("===================");


        list.set(2,"six");//设置的同时会返回被替换的元素
        System.out.println(list);
    }
}
